Spray it with contact cleaner,or some sort electronic spray.If not use some rubbing alcohol on a cue tip and get the back of the control knob wet.Lay it down if you have to.Then turn left to right a good few times .This should do the trick.If it does not then the control is one of those varying type,and it is bent,and making one contact loud.
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Spray it with contact cleaner,or some sort electronic spray.If not use some rubbing alcohol on a cue tip and get the back of the control knob wet.Lay it down if you have to.Then turn left to right a good few times .This should do the trick.If it does not then the control is one of those varying type,and it is bent,and making one contact loud.